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Indicia reading apparatus having reduced trigger-to-read time

a reading apparatus and trigger-to-read technology, applied in the field of reading apparatuses, can solve the problems of consuming additional processing time, unable to read the trigger, and unable to meet the requirements of illumination reading conditions,

Active Publication Date: 2010-06-22
HAND HELD PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to an improved indicia reading apparatus that can quickly and accurately decode indicia, such as barcodes, even in challenging conditions such as long range reading and poor illumination. The invention addresses the need for faster and more efficient indicia reading apparatuses that can capture and process image data quickly. The invention includes an image sensing and processing circuit that can incorporate various filter masks for digital filtering of image data, as well as a pre-capture configuration for faster image data capture. The technical effects of the invention include improved speed and accuracy of indicia reading, as well as improved image quality even in challenging conditions.

Problems solved by technology

However, challenges continue to be noted with presently available indicia reading apparatuses.
Because of the increased depth of field available with currently available reading apparatuses such as the IT4XXX imaging module, poor illumination reading conditions are more commonly encountered.
Such image sensors generate more image data, which consumes additional processing time.

Method used

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  • Indicia reading apparatus having reduced trigger-to-read time
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  • Indicia reading apparatus having reduced trigger-to-read time

Examples

Experimental program
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Effect test

example 1

[0076]Computational circuit 1106 can convolve each pixel value with each of the above edgelets and then sum the absolute value of each convolution calculation to determine an edge strength score for each pixel value. For a 16×16 block with a 2×2 edgelet detection mask 2 rows of row buffer circuit 1102 may be utilized. Computational circuit 1106 can include a counter which sums the calculated edge strength scores for each pixel value determined with use of a pair of 2×2 edgelets until each edge strength score within a 16×16 block has been summed, at which time computational circuit 1106 can output a result of the summation (which can be a scaled output). Such summation can be regarded as a block edge strength score. Computational circuit 1106 can also include a comparator that is configured to record the maximum block edge strength score, the average block edge strength score, and the minimum block edge strength score for each frame output. Such a comparator can compare block edge st...

example 2

[0080][-111-1-11]⁢⁢and⁢⁢[1-11-11-1]⁢⁢and⁢⁢[1-1-111-1]⁢⁢and⁢⁢[-11-11-11]⁢⁢and⁢⁢[1-11-111]⁢⁢and⁢⁢[-1-1111-1]⁢⁢and⁢⁢[1-1-11-11]⁢⁢and⁢⁢[-111-1-1-1]⁢⁢and⁢⁢[-11-111-1]⁢⁢and⁢⁢[11-1-1-11]⁢⁢and⁢⁢[-111-11-1]⁢⁢and⁢⁢[1-1-1-111]]

example 3

[0081][[-1-1-1-11111]⁢⁢and⁢⁢[-11111-1-1-1]⁢⁢and⁢⁢[-1-11111-1-1]⁢⁢and⁢⁢[-1-12-12-12-1-1]⁢⁢and⁢⁢[1-11-11-11-1]⁢⁢and⁢⁢[1-11-11-1-11]⁢⁢and⁢⁢[1-11-1-11-11]⁢⁢and⁢⁢[2-1-1-12-1-1-12]]

[0082]By application of curvelets to pixel values, image sensing and processing circuit 502 detects a texture of a frame of image data prior to capture thereof into image frame memory 550 by detecting for the presence of curved edges in a frame of image data. Accordingly, by application of edgelets, image sensing and processing circuit 502 can detect for straight edges, and by application of curvelets can detect for curved edges in a frame of image data. By application of either an edgelet or a curvelet, image sensing and processing circuit 502 detects a texture of a frame of image data prior to capture of a frame of image data intro image frame memory 550. When configured to apply curvelets to image data, image sensing and processing circuit 502 can be configured to calculate block edge strength scores in the ...

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Abstract

A TTR time of a reading apparatus can also be reduced by designing an apparatus to exhibit a certain timing relationship between a receipt of a trigger signal and / or more of image capture and decoding. An apparatus in one embodiment can be configured to continuously capture frames of image data prior to receipt of a trigger signal and can further be configured so that an output decoded message is decoded from a frame of image data having a capture initiation time of prior to the time of receipt of a trigger signal. An apparatus configured to output a decoded message from a frame of image data having a capture initiation time of prior to a time of receipt of a trigger signal can have a TTR time of less than a frame capture period of the apparatus.

Description

CROSS REFERENCE[0001]This application claims priority under 35 U.S.C. §119(e) to Provisional Patent Application No. 60 / 814,950, entitled “Indicia Reading Apparatus Having Reduced Trigger-To-Read Time” filed Jun. 19, 2006 and to Provisional Patent Application No. 60 / 812,636, entitled “Indicia Reading Apparatus Having Reduced Trigger-To-Read Time” filed Jun. 9, 2006. Each of the above provisional applications is incorporated herein by reference. This application is also related to U.S. patent application Ser. No. 11 / 545,725 (now U.S. Patent Publication No. 2007 / 0284448) entitled “Indicia Reading Apparatus Having Image Sensing And Processing Circuit” filed Oct. 10, 2006 which is incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to sensing apparatuses in general and in particular to an image sensing apparatus which in one embodiment can incorporate indicia decoding functionality.BACKGROUND OF THE PRIOR ART[0003]Users of indicia reading apparatuse...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G06K7/10H04N23/40
CPCG06K7/14G06K7/10851
Inventor WANG, YNJIUN P.LONGACRE, JR., ANDREW
Owner HAND HELD PRODS
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